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(D) The eclipsed conformation of ethane is the least stable due to torsional strain caused by the repulsion between the hydrogen atoms on adjacent car

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$12.5 \ kJ / mol$

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(D) The eclipsed conformation of ethane is the least stable due to torsional strain caused by the repulsion between the hydrogen atoms on adjacent carbon atoms. Conversely,the staggered conformation is the most stable as the hydrogen atoms are as far apart as possible,minimizing repulsion. The energy barrier for rotation about the $C-C$ single bond in ethane is approximately $12.5 \ kJ / mol$ $(3 \ kcal / mol)$. Therefore,the energy difference between the staggered and eclipsed conformations is $12.5 \ kJ / mol$.

The energy difference between the staggered and eclipsed conformations of ethane is

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